1Mhz FM transmitter/receiver VCO/PLL help tips..

[swerv]

Hi! I'm new here so HEllo..

Here is what I have to do..

I need to make an FM transmitter at 1Mhz using a VCO (4046) with a 240Khz BW with an LF ampli

and for the receiver I need a BW of 150Khz with an RF ampli with a PLL for the demodulation.

So any help, tips, schematic, links.... would be really appreciated!!

thanks!

mat

 

[blueroomelectronics]

Did you try google?
**broken link removed**
**broken link removed**

 

[swerv]

Yeah I did... but didnt find anything really appropriate yet!

Thanks for the reply!

But I dont want to use a crystal.. And it has to be at 1Mhz straight. And the receiver will be at only 3-4meters.

 

[blueroomelectronics]

What's wrong with using a crystal?

 

[audioguru]

You don't need to use a crystal if you make an RC oscillator instead.

 

[swerv]

hmm ok here is a quick stupid question. I need to replace the function generation by a crystal or a RC oscillator?

 

[marcbarker]

This is a nice circuit... with a quaint hartley(?) vco oscillator in it.

Someone was asking on another thread "is der a way f mking a FM trns mor stabal?" and this does it quite well.

Everything to the left of the varicap is the stabilisation